Persisting data on disk using Hazelcast

I have installed HazelCast 2.5. I want to persist my records into disk. I learned that MapStore does this job. However i'm not sure how to implement MapStore.

Code I've written so far:

public class MyMaps implements MapStore<String,String> {

    public static Map<Integer, String> mapCustomers = Hazelcast.getMap("customers");

    public static void main(String[] args) {
        {
            mapCustomers.put(1, "Ram");
            mapCustomers.put(2, "David");
            mapCustomers.put(3, "Arun");

        }
    }
}

How do i put all these entries into disk.

Is it necessary to have a back-end like MySQL or PostgreSQL to use this class?

I believe the following function can be used:

public void delete(String arg0);
public void deleteAll(String arg0);
public void store(String arg0);
public void storeAll(String arg0);

I need a sample snippet of how to implement MapStore.

Please provide me with sample code.